Recent developments in waterborne polyurethane dispersions (WPUDs): a mini-review on thermal and mechanical properties improvement

2021 ◽  
Author(s):  
Swapnil M. Vaidya ◽  
Simran M. Jadhav ◽  
Mitesh J. Patil ◽  
Siddhesh U. Mestry ◽  
Umesh R. Mahajan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties ◽  
Recent Developments ◽  
Polyurethane Dispersions

Waterborne polyurethane nanocomposite reinforced with amine intercalated α-zirconium phosphate - Study of thermal and mechanical properties

Polymer ◽  
2020 ◽  
Vol 186 ◽  
pp. 122008 ◽  
Author(s):  
Manoj B. Kale ◽  
Nidhin Divakaran ◽  
Suhail Mubarak ◽  
Duraisami Dhamodharan ◽  
T. Senthil ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Zirconium Phosphate ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties

scholarly journals Polyurethane cationomers containing fluorinated soft segments with hydrophobic properties

2021 ◽  
Author(s):  
Piotr Król ◽  
Kinga Pielichowska ◽  
Bożena Król ◽  
Katarzyna Nowicka ◽  
Małgorzata Walczak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hard Segment ◽  
Molar Mass ◽  
Microphase Separation ◽  
Waterborne Polyurethane ◽  
Thermal And Mechanical Properties ◽  
Nmr Analysis ◽  
Hydrophobic Properties ◽  
Average Molar Mass ◽  
Soft Segments

AbstractThe synthesis of ecological waterborne polyurethane cationomers containing fluorinated polyol (0–20 wt.%) was successfully performed. FTIR and NMR analysis results confirmed the structure of the obtained polyurethane cationomers and incorporation of fluorinated component into the polyurethane chains. Average molar mass and phase structure of the obtained PU thin films were determined based on GPC, FTIR, WAXD and SEM-EDX results. The obtained cationomers have linear structures with clearly visible microphase separation of soft and hard segment domains; the presence of fluorinated polyol changes the strength of hydrogen bonds and in consequence degree of phase separation. The activation energy of glass transition was calculated based on multi-frequency DSC data. It has been shown that the presence of soft fluorinated segments in the cationomer structure strongly influences the hydrophobic, thermal and mechanical properties of the obtained films.

scholarly journals Chemical and Thermo-Mechanical Properties of Waterborne Polyurethane Dispersion Derived from Jatropha Oil

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 795
Author(s):  
Sariah Saalah ◽  
Luqman Chuah Abdullah ◽  
Min Min Aung ◽  
Mek Zah Salleh ◽  
Dayang Radiah Awang Biak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Film Formation ◽  
Consumer Preference ◽  
Waterborne Polyurethane ◽  
Crosslinking Density ◽  
Jatropha Oil ◽  
Free Standing ◽  
Polyurethane Dispersion ◽  
Total Volatile Organic Compounds ◽  
Polyurethane Dispersions

Nowadays, there is a significant trend away from solvent-based polyurethane systems towards waterborne polyurethane dispersions due to government regulations requiring manufacturers to lower total volatile organic compounds, as well as consumer preference for more environmentally friendly products. In this work, a renewable vegetable oil-based polyol derived from jatropha oil was polymerized with isophorone diisocyanate and dimethylol propionic acid to produce anionic waterborne polyurethane dispersion. Free standing films with up to 62 wt.% bio-based content were successfully produced after evaporation of water from the jatropha oil-based waterborne polyurethane (JPU) dispersion, which indicated good film formation. The chemical and thermo-mechanical properties of the JPU films were characterized. By increasing the OH numbers of polyol from 161 mgKOH/g to 217 mgKOH/g, the crosslinking density of the JPU was significantly increased, which lead to a better storage modulus and improved hydrophobicity. Overall, JPU produced from polyol having OH number of 217 mgKOH/g appears to be a promising product for application as a binder for wood and decorative coatings.

Investigation of Hyperbranced Polyesters with Different Generation and their Application in Waterborne Polyurethanes

2012 ◽  
Vol 152-154 ◽  
pp. 91-96 ◽  
Author(s):  
Dong Ya Yang ◽  
Li Han ◽  
Han Qing Zhang ◽  
Feng Xian Qiu
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Crosslinking Agent ◽  
Waterborne Polyurethane ◽  
Hyperbranched Polyester ◽  
Aqueous Dispersions ◽  
Hyperbranched Polyesters ◽  
Waterborne Polyurethanes ◽  
Lower Viscosity ◽  
Polyurethane Dispersions

The 1st, 2nd and 3rd generations of hydroxyl-terminated hyperbranched polyesters (HBPE-1, HBPE-2, and HBPE-3) were synthesized. A3rd generation hyperbranched polyester (HBPE-3) was used as original crosslinking agent to prepared hyperbranched waterborne polyurethane dispersions (HPU). FTIR spectra confirmed that this reaction really took place. The experimental data indicated that, compared with the linear one, the hyperbranched HPU aqueous dispersions exhibited lower viscosity, and larger particle size. For the hyperbranched HPU films, mechanical properties were obviously enhanced.

Polyamides containing a biorenewable aromatic monomer based on coumalate esters: from synthesis to evaluation of the thermal and mechanical properties

2021 ◽  
Vol 12 (16) ◽  
pp. 2379-2388
Author(s):  
Jules Stouten ◽  
Aleksandra A. Wróblewska ◽  
Glenn Grit ◽  
Jurrie Noordijk ◽  
Bert Gebben ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Propionic Acid ◽  
Terephthalic Acid ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides ◽  
Aromatic Monomer

A new biobased alternative for terephthalic acid (TPA) in (semi-)aromatic polyamides is proposed, namely 4-carboxybenzene propionic acid (4CBPA).

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